Unable to merge AWS certification accounts.

I thought you must contact AWS Training and Certification Support to request a manual merge.

https://aws.amazon.com/certification/faqs/

I understand you're experiencing difficulties merging your AWS Certification accounts and need your current valid certification to sync properly with Credly. Let me help clarify the situation and next steps.

When the self-service merge option fails with that specific error message, it indicates that your accounts require manual intervention from AWS Training and Certification support rather than standard AWS technical support. This is a specialized process that the certification team handles directly.

For AWS Certification account issues, including merges that cannot be completed through self-service, you should contact AWS Training and Certification support specifically. You can reach them through the AWS Training and Certification Help page or by visiting the AWS Certification support portal at https://www.aws.training/certification.

When you contact them, be prepared to provide:

• Details about both certification accounts (without sharing sensitive information publicly)
• Information about which certifications are in each account
• Confirmation that you own both accounts
• Details about the Credly sync issue you're experiencing

The AWS Training and Certification team has the specialized tools and access needed to handle certification account merges that don't meet the automated criteria. They can also help ensure your current valid certification properly syncs with Credly once the accounts are merged.

If you've already submitted requests through the general AWS Support portal, I'd recommend specifically reaching out through the AWS Training and Certification support channels, as they handle these certification-specific account issues separately from general AWS technical support cases.

I apologize that my UI is in Japanese, but why not try the "Merge accounts" option at the bottom here?